security-and-privacy/CanvasBlocker
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Code Releases Activity

Refined audio faking procedure.

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This commit is contained in:
kkapsner 2018-06-21 00:20:41 +02:00
parent c13a6f88b3
commit df5109bbf6
2 changed files with 61 additions and 36 deletions
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95
lib/modifiedAudioAPI.js
View File

@ -18,57 +18,82 @@
var randomSupply = null;
const audioFakeRate = {
"1": function(array){return 1;},
"10": function(array){return 10;},
"100": function(array){return 100;},
"1000": function(array){return 1000;},
"0.1%": function(array){return array.length / 1000;},
"1%": function(array){return array.length / 100;},
};
function getAudioFakeRate(array, prefs){
var func = audioFakeRate[prefs("audioFakeRate")];
if (typeof func === "function"){
return func(array);
}
else {
return 10;
const getAudioFakeRate = function(){
const audioFakeRate = {
"1": function(array){return 1;},
"10": function(array){return 10;},
"100": function(array){return 100;},
"1000": function(array){return 1000;},
"0.1%": function(array){return array.length / 1000;},
"1%": function(array){return array.length / 100;},
};
return function getAudioFakeRate(array, prefs){
var func = audioFakeRate[prefs("audioFakeRate")];
if (typeof func === "function"){
return func(array);
}
else {
return 10;
}
};
}();
const getAudioNoiseLevel = function(){
const audioNoiseLevel = {
"minimal": 0.0001,
"low": 0.0005,
"medium": 0.001,
"high": 0.005,
"maximal": 0.01
};
return function getAudioNoiseLevel(prefs){
return audioNoiseLevel[prefs("audioNoiseLevel")] || 0.0001;
};
}();
function forEachFixedIndex(prefs, callback){
if (prefs("audioUseFixedIndices")){
prefs("audioFixedIndices")
.split(",")
.map(function(str){
return parseInt(str, 10);
}).filter(function(num){
return !isNaN(num);
}).filter(function(num, i, array){
return array.indexOf(num) === i;
}).forEach(callback);
}
}
const audioNoiseLevel = {
"minimal": 0.0000001,
"low": 0.00001,
"medium": 0.001,
"high": 0.01,
"maximal": 0.1
};
function getAudioNoiseLevel(prefs){
return audioNoiseLevel[prefs("audioNoiseLevel")] || 0.0000001;
function forEachIndex(array, prefs, callback){
var l = array.length;
var rate = getAudioFakeRate(array, prefs);
var indexRng = randomSupply.getIndexRng(rate, l, window);
var start = 0;
forEachFixedIndex(prefs, function(index){
callback(index, start);
start += 1;
});
for (var i = start; i < rate; i += 1){
callback(indexRng(i), i);
}
}
function fakeFloat32Array(array, window, prefs){
if (prefs("protectAudio")){
var l = array.length;
var rate = getAudioFakeRate(array, prefs);
var noiseLevel = getAudioNoiseLevel(prefs);
var indexRng = randomSupply.getIndexRng(rate, l, window);
var rng = randomSupply.getRng(rate, window);
for (var i = 0; i < rate; i += 1){
var index = indexRng(i);
array[index] += (rng(i) / 0xffffffff - 0.5) * noiseLevel;
}
forEachIndex(array, prefs, function(index, i){
array[index] *= 1 + (rng(i) / 0xffffffff - 0.5) * noiseLevel;
});
}
}
function fakeUint8Array(array, window, prefs){
if (prefs("protectAudio")){
var l = array.length;
var rate = getAudioFakeRate(array, prefs);
var indexRng = randomSupply.getIndexRng(rate, l, window);
var rng = randomSupply.getValueRng(rate, window);
for (var i = 0; i < rate; i += 1){
var index = indexRng(i);
forEachIndex(prefs, function(index, i){
array[index] = rng(array[index], i);
}
});
}
}

2
lib/settingDefinitions.js
View File

@ -174,7 +174,7 @@
},
{
name: "audioNoiseLevel",
defaultValue: "low",
defaultValue: "minimal",
options: ["minimal", "low", "medium", "high", "maximal"]
},
{